Heat dissipation fans are widely applied in numerous fields. The operation of machines necessitates that the fans expel heat to ensure normal operation. Once there are issues with the heat dissipation fans themselves, it will directly have an impact on the service life of the equipment. Heat dissipation fans are prone to problems in the following four aspects:

I. Design Reasons
Improper design. During the design process, the coordination of components was not taken into account, and the dynamic characteristics are poor, resulting in vibration or noise during the machine’s operation. The structure is unreasonable, and the inappropriate use of steel leads to stress concentration. The body material is prone to cracking. The materials of the components are of poor quality, and their strength fails to meet the standard, making accidents likely to occur during use.

II. Installation and Maintenance Reasons
Improper mechanical installation, misalignment of components, or a defective shaft system lead to a large preload. The rotor is not positioned correctly, and the original matching system of the machine is damaged due to failure to conduct maintenance as required.

III. Operation
The process parameters of the machine deviate significantly from the design values. Frequently, the machine is operated at an excessive speed or overloaded during operation, or it runs at a low speed and under a low load, failing to achieve the machine’s working performance. The operating point is close to or within the critical speed range. The lubrication or cooling of the heat dissipation fan is inadequate. Improper operation during the start and stop of the machine or during the acceleration and deceleration processes leads to the failure of the body temperature to reach the appropriate level, uneven thermal expansion, or the machine being annealed due to overheating and losing its inherent strength.

IV. Machine Deterioration
The long-term operation of the machine causes components such as the shaft to fatigue, resulting in local damage to the rotor. The components are affected by impact forces, leading to problems such as local abrasion and grinding damage.